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Mixing and Segregation Processes in Turbula Blender

Published online by Cambridge University Press:  01 February 2011

Nathalie Sommier
Affiliation:
Laboratoire de Physique Pharmaceutique, UMR 8612 CNRS - Université Paris XI, 92296 Châtenay-Malabry cedex, France.
Patrice Porion
Affiliation:
Centre de Recherche sur la Matière Divisée, UMR 6619 CNRS - Université d'Orléans, F-45071 Orléans cedex 2, France.
Pierre Evesque
Affiliation:
Laboratoire de Mécanique MSSM, UMR 8579 CNRS - Ecole Centrale Paris, F-92295 Châtenay-Malabry cedex, France
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Abstract

Magnetic Resonance Imaging (MRI) technique was used to study the mixing and segregation processes of granular materials in a sophisticated tumbling blender (Turbula® mixer) using binary mixtures of sugar beads of different diameters d. Its motion generates mixtures with complex patterns. Effects of some parameters (beads diameter ratio, rotation speed, mixing time) were checked on segregation and mixing processes. We report in this paper, a qualitative and quantitative analysis of these phenomena. A segregation index S was defined to study the homogeneity and the kinetics of the mixing/segregation processes. When the ratio of bead diameters dmax/dmin is approximately 1, mixing process is observed but segregation occurs as soon as dmax/dmin is greater than 1.1.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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